Rock-drill.



I ROCK DRJLL. APPLICATION FILE D JULY 23,1917.

A. swmn.

HUUIEQDRILL.

fipeeifleation of Letters Patent.

Patch-todd er, 33d, time},

tlfls'heal eltplleatioi filed t, 1.131%, No. WWW? Divided mid this application tiled Jilly $8, with Serial No. 1.823%.

Zia oil whom it may concern .lEle it known that it, WILLIAM 1%,. SMITH, e citizen of the United ,dta'tes, residin at Denver, in the county of Denver and tate of Qolorsdo, have invented certain new and useful improvements in Rock -Drills, otwhich the toliowing is a specification.

The present invention in its preferred embodiment relates to rock drills of the hammer type, and one of the primary ob jects is to provide a novel and simple combination of great effectiveness, including o hemmerpistoi'i that can be reversed, so that either end may be utilized for deliv ering the blow, end, at the same time so construct said piston and partsassociated therewith, that cleansing fluid can be delivered to the drill bit, irrespective of the reversal of the piston.

The present application is a division of my ce- 'iendinfi; application, Serial- No. ldtifif'i', filed liay $1917,

The drawing is'a'iongitudinal sectional, view through the preferred ernldodiment of the invention. i

lo. the embodiment illustrated, the drill actuating motor comprises a cylinder memvvhich consists ct at body 7, a'rcar heed hand a front head 9. The body 7 is provided with a piston head chamber 11 and the rear head 8 has a neck chamber 12 communicating with the rear end of the chamber 11, and having an enlarged rear portion 13. The front end 01 the body Y is provided with a rediiced portion 14,1111 which is formed'a forwardly extending neck chamber 15 that communicates with the front end of the chamber 11, said noel: chamber 15 having anopen front end. i

@foerating in the cylinder member is a piston, comprising a central head 16 that recipriiicates'in the head chamber ll, said head being provided with integral oppositely extending necks 17 and 18, these necks being duplicates one of the other, and opersting respectively in the neck chambers 12 and 15. The neck 17 is provided contiguous to the head 16 with a reduced portion lliOTlil inc; an annular channel 19, while the neck 18 has a corresponding portion or channel 26. The enlarged rear end of the neck 17, it will he noted, is movahle into the enlarged portion of the neck chamber 12, While the firont cit-the frost sect; he is edepted pass beyond the reduced portion it, in vvhlchthe neck chamber 15 is located.

A tapered valve seat 23, is provided in which is rotatably mounted a tapered valve 24;. The motive fluid is controlled by said valve, This valve is provided with a lon itudinal channel 26' communicating with tie chamber 22,. and said channel has a lateral portQT that is movable into and out of communication with a passageway 28 formed longitudinally in the rear-head=8a1id the body 7. The passageway has a lateral post 29 communicating with the enlarged portion 13 of the neck chamber 12. Anotherlateral port 30 opens into an anniilar groove 31 formed in the front portion of the neck chamber 12. A; third port opens into an annular groove 33 formed in the rear portion of the front neck chamber 15.

It Will be evident that WlMBH MOlElVQ fluid is admitted to the passageway 28, by turning the throttle valve 24:, so that the port it? will register with said passageway, inc-- tive fluid will be constaritly in the rear enlarged portion 13 of the neck chamber 12, and also will enter the grooves 31 and 33 with the hninmer piston in the position. illus trated. This motive fluid will find its Way from the groove. 33 into the head chamber 11 in advance of the piston head 16 hccadse of the position of the channel 20, Whereas the fluid from the groove 31 will be cut-- 01d, from admission to the rear ofthehead 16,

The portion of the head chamber 11 in rear of-said head is, however, open to the atmosphere through an exhaust port 3-1 its a c0nsequence,thc motive fluid acting against the front face of the head 16 will drive the piston rearwardly until. the front portion of the groove or channel 20 is cut oil from the groove 33. 'The rearward movement oil the piston will of course carry the groove or channel 19 of the rear neck 17 to a position where it will afl'ord; communication between the groove 31 and the rear end of the head-chamber 16, whereupon motive fluid will operate against the rear face oi the piston head 16 and drive the piston forweirdly When in this position, the exhaust inter-eel chamber at iii Which-is eotetahlgv mounted a chuck 36- having an angular socket. 37 adapted to receive the drill steel or bit 38 operated on by the hammer piston.

From the foregoing,' it' is thought that the construction, operation and many advantages of the herein described invention. will be apparent to those skilled in the art, with advantages of the invention.

-Having thus fully described my invention, What I claim as new, and desire to secure by Letters Patent, is

1. In drilling apparatus, the combination with a cylinder member having a head chamber and oppositely disposed neck chambers extending from the head chamber, of a reversible piston comprising a head operating in the head chamber and oppositely extending necks operating respectively in the neck chambers, means controlled by the necks respectively for alternately supplying motive fluid to opposite sides of the head, said means being controlled by either neck in either neck chamber, means for maintaining a constant supply of fluid under pressure against a rear surface of the neck in the rear neckchapy ber, the other neck constituting a hammer head for delivering the blows of the piston, and means for holding a tool in line with said other neck to receive the force of such blows. I

2. In drilling apparatus, the combination with a cylinder member having a head chamber aiidcppositely disposed neck chambers extending from the head chamber, of a reversible piston comprising a head operating in the head chamber and oppositely extend,-

ing necks operating respectively in the neck chambers, a motive fluid supply means having admission ports for respectively supplying motive fluid to the head chamber on opposite sides of the piston head, said'necks having means for alternately admitting and cutting off the supply from the ports to the head and either neck opcratingio thus control the ports in either neck chamber accordingly as the piston is reversed, said motive fluid supply means alsohaving a port admitting a constant, supply of motive iiuid into the rear neck chamber to constantly act against the rear surface of the 116 00, therein, the other neck constituting a ham" 'mer head for delivering the blows of the piston, and means -for hoiding a tool in line With said other neck to receive the force of such blows.

3. In drilling apparatus, the combination with a cylinder member having a head chain ber and oppositely disposed neck chambers extending from the head chamber, of a reversible piston comprising a head operating in the head chamber and oppositely extending necks operating respectively in the neck chambers, motive fluid supply means includ ing a controlling valve and a conduit dis posed longitudinally of the cylinder mem-. her, said conduit having a lateral port communicating with the rear neck chamber to constantly admit motive fluid thereto against the rear end of the neck therein, and other lateral ports for respectively supplying motive fluid to the head chamber on opposite sides of the piston head, said necks having means for alternately admitting and cutting off the supply from the ports to the head and either neck operating to thus control. the ports in either neck chamber accordingly as the piston is reversed, the forward neck in either case constituting a. hammer head for delivering the blows of the piston, and means for holding a tool in line with the front neck chamber to receive such blows from the piston.

4. In apparatus of the character described, the combination with a cylinder member having neck chambers associated therewith, of a piston head operable in the cylinder member and having necks carried. thereby for interchangeably engaging the neck (llillTL bers, a constant air chamber communicating with one of the neck chambers, and a chuck F located in advance of the other neck chamber for receiving a tool to be operated on by the piston.

In testimony whereof, l afiix my signature .in the presence of two witnesses.

\VI'LLIAIH A, SMITH. lVitnesses C. F. Crmiunuus, J. P. FLYNN. 

